Getting straight nitro is getting difficult in states. They are selling it as 50/50 mix with methanol other wise you need a special license.

So I am trying to determine a basic equation for diluting the 50% solution to a 16% solution to specific quantity (in this case 900ml).

I was able to determine that I need to mix 16 parts of 50/50 solution with 34 parts of methanol...but I cant figure out the equation to mix to a specific ml amount ( be it 1 liter,2.5 liters etc)

Secondly what is your opinion of synthetic oil vs pure caster oil?